]> andersk Git - openssh.git/blame - fake-getaddrinfo.c
- Merged OpenBSD IPv6 patch:
[openssh.git] / fake-getaddrinfo.c
CommitLineData
48e671d5 1/*
2 * fake library for ssh
3 *
4 * This file includes getaddrinfo(), freeaddrinfo() and gai_strerror().
5 * These funtions are defined in rfc2133.
6 *
7 * But these functions are not implemented correctly. The minimum subset
8 * is implemented for ssh use only. For exapmle, this routine assumes
9 * that ai_family is AF_INET. Don't use it for another purpose.
10 *
11 * In the case not using 'configure --enable-ipv6', this getaddrinfo.c
12 * will be used if you have broken getaddrinfo or no getaddrinfo.
13 */
14
15#include "includes.h"
16#include "ssh.h"
17
18#ifndef HAVE_GAI_STRERROR
19char *
20gai_strerror(ecode)
21int ecode;
22{
23 switch (ecode) {
24 case EAI_NODATA:
25 return "no address associated with hostname.";
26 case EAI_MEMORY:
27 return "memory allocation failure.";
28 default:
29 return "unknown error.";
30 }
31}
32#endif /* !HAVE_GAI_STRERROR */
33
34#ifndef HAVE_FREEADDRINFO
35void
36freeaddrinfo(ai)
37struct addrinfo *ai;
38{
39 struct addrinfo *next;
40
41 do {
42 next = ai->ai_next;
43 free(ai);
44 } while (ai = next);
45}
46#endif /* !HAVE_FREEADDRINFO */
47
48#ifndef HAVE_GETADDRINFO
49static struct addrinfo *
50malloc_ai(port, addr)
51int port;
52u_long addr;
53{
54 struct addrinfo *ai;
55
56 if (ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) +
57 sizeof(struct sockaddr_in))) {
58 memset(ai, 0, sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
59 ai->ai_addr = (struct sockaddr *)(ai + 1);
60 /* XXX -- ssh doesn't use sa_len */
61 ai->ai_addrlen = sizeof(struct sockaddr_in);
62 ai->ai_addr->sa_family = ai->ai_family = AF_INET;
63 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
64 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
65 return ai;
66 } else {
67 return NULL;
68 }
69}
70
71int
72getaddrinfo(hostname, servname, hints, res)
73const char *hostname, *servname;
74const struct addrinfo *hints;
75struct addrinfo **res;
76{
77 struct addrinfo *cur, *prev = NULL;
78 struct hostent *hp;
79 int i, port;
80
81 if (servname)
82 port = htons(atoi(servname));
83 else
84 port = 0;
85 if (hints && hints->ai_flags & AI_PASSIVE)
86 if (*res = malloc_ai(port, htonl(0x00000000)))
87 return 0;
88 else
89 return EAI_MEMORY;
90 if (!hostname)
91 if (*res = malloc_ai(port, htonl(0x7f000001)))
92 return 0;
93 else
94 return EAI_MEMORY;
95 if (inet_addr(hostname) != -1)
96 if (*res = malloc_ai(port, inet_addr(hostname)))
97 return 0;
98 else
99 return EAI_MEMORY;
100 if ((hp = gethostbyname(hostname)) &&
101 hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
102 for (i = 0; hp->h_addr_list[i]; i++)
103 if (cur = malloc_ai(port,
104 ((struct in_addr *)hp->h_addr_list[i])->s_addr)) {
105 if (prev)
106 prev->ai_next = cur;
107 else
108 *res = cur;
109 prev = cur;
110 } else {
111 if (*res)
112 freeaddrinfo(*res);
113 return EAI_MEMORY;
114 }
115 return 0;
116 }
117 return EAI_NODATA;
118}
119#endif /* !HAVE_GETADDRINFO */
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